621-62 tug help

[akguy34]

So i just picked up this 1962 621-62 tug
from a small town marine repair shop and
had a few questions, the battery cables
are mismached homemade whatever works to
get it running so the first question is
was these 12v systems negitive ground?
When we went to jump it was set to
negitive ground but the alternator fried
amd not sure if they messed up and
installed the battery negitive instead of
positive groundor the alternator was just
toast.

Second on the passinger side of the engne
compartment there is what looks like a
red filter amd i cant see off hans what
it goes to amd the writing is worn off
it, anyone know what it was for?

Third there apperes to be a foor buttin
starter or light swich below the steering
column i am unsure what it originally
went to or if it was an afterward add on
for somthing.

Thank you, first time with a ford or a
tractor this new and since it was
surplused out and a small town mechanic
shop owned it im trying to find out what
was original and what was added later

 

[Scott D Orbaker]

akguy34,

Welcome to the forum.
I believe that tractor was originally a 6 volt, positive ground system. If it was upgraded to a 12 volt, may have change to a negative ground.
As for that button, that is(was) the starter button. Of course that may have been change too.

Good luck and enjoy.

Scott

 

[akguy34]

Ive read there are both versions a 6v which was positive ground and a 12v which was negative ground but spotty info the old regulator bolted on the firewall is 14v and the old windshield wiper relay is 12v i tryed getting the remaining light bulbs out to check but they were rusted in. I would think if we jumped it netural ground the starter would spin backwards and the bendex wouldnt engage the fly wheel but everything i can figuer is circumstantial and i really dont want to fry a new altand have to drive to town agian for parts

 

[JoeM(GA)]

this is from the below listed owners manual I have, shoot me your email if you want PDF of it

 

[akguy34]

Awsome thank you that would be very helpful

 

[IndFord]

In the 601/801 series the diesel was 12 volt negative ground and the gasoline was 6 volt postive ground. Here a link to another thread that has more information;
Yesterday Tractor 621 21

 

[akguy34]

Thank you a guy said he will email me the pdf manuel but i have to figuer out what the story with mine is then its all 12 volt but possible the last person flubbed amd put the battery in the wrong what

 

[akguy34]

The parts thats getting me also is the 12v battery that is there is installed negative ground when jumped the starter spins the engine in my mind if backwards positive ground, the bendex shouldn't engage the flywheel

 

[Sean in PA]

(quoted from post at 19:07:19 07/27/23) The parts thats getting me also is the 12v battery that is there is installed negative ground when jumped the starter spins the engine in my mind if backwards positive ground, the bendex shouldn't engage the flywheel

The entire starter circuit, which includes the solenoid, bendix and starter motor, will operate properly regardless of the polarity hookups of the battery.

 

[KCM]

Second on the passinger side of the engne
compartment there is what looks like a
red filter amd i cant see off hans what
it goes to amd the writing is worn off
it, anyone know what it was for?

The filter is for the hydraulic system of the torque convertor. The 621-62 is a different animal as it does not have a traditional clutch. They mated a torque convertor to a tractor 4-speed transmission just for the military tug. It operates much like a standard 4-speed tractor to shift, push the pedal to change gears, but more like an automatic transmission when you release the pedal. It will "slip" so you can increase engine speed and power to get a large load moving.

On the alternator, almost all are 12 volt negative ground on cars and tractors, though there are aftermarket one-wire 6 volt alternators available too.

 

[Majorman]

Does not matter which way round your ground is, the starter will always turn in the same direction. Most alternators have to be negative ground though due to internal diodes that can be fried if connected the wrong way round.

 

[akguy34]

so, In conclusion if anyone else has these issues I think I got it figured out:

Fords civilian tractors if gasoline are 6v positive ground, if diesel it is a 12v negative ground. BUT if it's a military contract it like my tug it's a gasoline 12v negative ground. and the fan belt is A41 but i also believe an A40 will fit with a replacement gm one wire alternator.

the filter on the passenger side is for the transmission and from what I can find from our napa is it is number 1189.

the oil filter my napa matched up was number 1068.

Thank you all for your help